Well pressure sealing-assisted VR plug

Abstract

The utility model discloses a well pressure sealing assisting VR plug which is used for being matched with an oil casing head side outlet and comprises a VR plug body in threaded connection with the oil casing head side outlet, a first installation cavity for containing a piston is formed in the VR plug body, and a piston rod is inserted into the first installation cavity and connected with the piston. A channel extending from the bottom end of the piston rod to the first mounting cavity is formed in the piston rod, so that the channel communicates the bottom of the piston rod with the lower side of the piston in the first mounting cavity; the piston rod is sleeved with a rubber sleeve, so that when the piston and the piston rod are pushed by pressure in the well to move outwards, the piston rod compresses the rubber sleeve to expand so as to seal the oil casing head side outlet channel. The channel is arranged in the piston rod, and the rubber sleeve is sleeved outside the piston rod in a limiting manner, so that when the valve is replaced under pressure and the piston and the piston rod are pushed to move outwards by pressure in a well, the piston rod compresses the rubber sleeve to expand so as to seal the outlet channel on the head side of the oil casing, the well pressure is assisted in sealing, and the success rate of replacing the valve under pressure is improved.

Description

Technical Field

[0001] The utility model relates to the technical fields of maintenance and repair of wellhead devices and casing heads in the oil and gas industry, valve replacement under pressure, and wellhead pressure rectification, and more specifically, is a well pressure-assisted VR plugging device. Background Art

[0002] During the oil and gas production process, abnormal situations such as internal and external leakage of the main control valve of the casing head often occur. In order to solve such safety hazards, the method of pressure valve replacement is usually adopted. The specific implementation method is: if the outlet of the casing head side has an internal thread that matches the VR plug, the external thread of the VR plug is inserted to match the internal thread to seal the outlet of the casing head side, so that the faulty valve can be replaced. Some wellhead devices have been out of the factory for a long time, the fluid in the well has corroded, or there are foreign objects in the VR plug threads, which causes the VR plug to be poorly sealed and leads to the failure of pressure valve replacement. Therefore, there is an urgent need for a VR plug that can ensure the effectiveness of pressure valve replacement. Utility Model Content

[0003] The purpose of the utility model is to provide a well pressure assisted sealing VR plug, which is used to solve the technical problem in the prior art of failure of pressure valve replacement due to poor sealing of the VR plug caused by the long factory time of the wellhead device, corrosion of the fluid in the well or foreign matter in the VR plug thread.

[0004] The utility model solves the above problems through the following technical solutions:

[0005] A well pressure-assisted sealing VR plug is used to cooperate with the oil casing head side outlet, comprising: a VR plug body, a piston, a rubber cylinder and a piston rod; the VR plug body is threadedly connected to the oil casing head side outlet, and a first installation cavity for accommodating the piston is formed therein, and the piston seal is arranged in the first installation cavity; the piston rod is inserted into the first installation cavity from the bottom of the VR plug body and connected to the piston, and a channel is formed in the piston rod extending from the bottom end of the piston rod to the first installation cavity, so that the channel connects the bottom of the piston rod and the lower side of the piston in the first installation cavity; the piston rod is outer-circuited with a rubber cylinder, and the rubber cylinder is arranged between the outside of the bottom end of the VR plug body and the inside of the bottom end of the piston rod, so that when the well pressure pushes the piston and the piston rod to move outward, the piston rod compresses the rubber cylinder to expand to seal the oil casing head side outlet channel.

[0006] As a further improvement, the VR plug body is provided with a VR plug thread connected with the outlet thread on the oil casing head side.

[0007] As a further improvement, a first sealing ring is provided outside the VR plug body to match the sealing cone surface of the oil casing head side outlet, and the first sealing ring is located below the VR plug thread.

[0008] As a further improvement, the piston rod is connected to the piston internal thread.

[0009] As a further improvement thereof, a second sealing ring is arranged at the insertion position between the piston rod and the VR plug body.

[0010] As a further improvement thereof, a third sealing ring is arranged at the contact position between the piston and the VR plug body.

[0011] As a further improvement thereof, the channel is in the shape of "L".

[0012] As a further improvement thereof, a J-shaped groove is formed at the upper end of the VR plug body for connecting a VR plug taking and placing device, so that the hook of the VR plug taking and placing device is hung on the J-shaped groove of the VR plug body, and quick installation of the VR plug is achieved.

[0013] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0014] The utility model discloses a channel is arranged in the piston rod and is communicated with the lower side of the piston in the first installation cavity, and a rubber tube is arranged on the piston rod, so that when the piston and the piston rod are pushed outward by the pressure in the well when the valve is replaced under pressure, the piston rod compresses the rubber tube to expand to seal the outlet channel of the oil casing head side, so that the VR plug and the oil casing head side outlet are sealed for the second time when the first sealing ring is not sealed in place, and the well pressure is assisted to seal, thereby improving the success rate of replacing the valve under pressure. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structural schematic view of the utility model of a kind of well pressure assisted sealing VR plug;

[0016] Figure 2 It is a schematic view of the appearance of the utility model of a kind of well pressure assisted sealing VR plug;

[0017] Figure 3 It is a sectional view of the J-shaped groove of the utility model;

[0018] Figure 4 It is a schematic view of the cooperation of the utility model of a kind of well pressure assisted sealing VR plug and oil casing head side outlet.

[0019] Reference signs: 1, VR plug body;2, piston;3, third sealing ring;4, first sealing ring;5, second sealing ring;6, rubber tube;7, piston rod;71, channel;8, J-shaped groove;9, VR plug thread;10, sealing cone surface. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example

[0022] Combined with attachment Figure 1-4 As shown, a well pressure assisted sealing VR plug is used to cooperate with the outlet of the oil casing head side, including: a VR plug body 1, a piston 2, a first sealing ring 4, a rubber cylinder 6 and a piston rod 7, etc., wherein the VR plug body 1 is connected to the internal thread of the oil casing head side outlet, that is, the VR plug connection thread, and a first installation cavity for accommodating the piston 2 is formed therein, and the piston 2 is sealed in the first installation cavity; the piston rod 7 is inserted into the first installation cavity from the bottom of the VR plug body 1 and is connected to the internal thread of the piston 2; and a channel 71 is formed in the piston rod 7, and the channel 71 is connected to the piston rod 7. The bottom end of the plug rod 7 extends to a position close to the top end of the piston rod 7 and extends to the side of the piston rod 7, so that the channel 71 connects the bottom of the piston rod 7 with the lower side of the piston 2 in the first installation cavity; the piston rod 7 is outer-circuited with a rubber sleeve 6, which is arranged between the outside of the bottom end of the VR plug body 1 and the inside of the bottom end of the piston rod 7, so that when the well pressure pushes the piston 2 and the piston rod 7 to move outward, the piston rod 7 compresses the rubber sleeve 6 to expand and seal the outlet channel on the oil casing head side, so as to achieve secondary sealing of the VR plug and the oil casing head side outlet when the first sealing ring 4 is not sealed in place.

[0023] The VR plug body 1 is provided with an external thread, namely, a VR plug thread, which cooperates with the internal thread of the oil casing head side outlet, and a first sealing ring 4 is provided below the external thread to seal with the oil casing head side outlet. In this embodiment, the first sealing ring 4 cooperates with the sealing cone surface inside the oil casing head side outlet to achieve a sealed connection between the oil casing head side outlet and the VR plug body.

[0024] Preferably, a second sealing ring 5 is provided at the insertion point between the piston rod 7 and the VR plug body 1, and a plurality of third sealing rings 3 are provided at the contact point between the piston 2 and the VR plug body 1. The first sealing ring 4, second sealing ring 5, third sealing ring 3, and other sealing ring structures achieve a sealed installation at all locations of the entire VR plug. In this embodiment, the channel 71 is arranged in an "L" shape.

[0025] In an optional embodiment, a J-shaped groove 8 for connecting to the VR plug picking and delivering device is formed at the upper end of the VR plug body 1. By cooperating with the VR plug picking and delivering device, the hook of the VR plug picking and delivering device can be quickly engaged with the J-shaped groove 8 of the VR plug body 1, thereby realizing quick installation with the VR plug and facilitating control operations of the VR plug.

[0026] The VR plug body 1 of the present invention is processed with a J-shaped groove 8 for connecting the VR plug picking and delivering device and a VR plug thread 9 connected to the VR plug thread at the oil casing head side outlet. The piston rod 7 is processed with a channel leading to the rear end of the piston, so that the well pressure can reach the space under the piston 2 in the first installation cavity through this channel.

[0027] During use, the VR plug is delivered to the VR plug connection thread at the outlet of the oil casing head through the VR plug delivery device, and the VR plug body 1 is rotated to seal the VR plug and the outlet of the oil casing head. If the VR plug is not fully installed, that is, the first sealing ring 4 does not reach the sealing cone 10 of the VR plug delivery device, the VR plug and the outlet of the oil casing head will not be sealed tightly. At this time, when the VR plug is depressurized and sealed at the lower end, due to the obstruction of the VR plug body, there is a pressure difference between the upper and lower parts of the VR plug. The well pressure pushes the piston 2 and piston rod 7 outward, and the piston rod 7 compresses the rubber sleeve 6 to expand and seal the outlet channel of the oil casing head. At this time, the well pressure acts on the rubber sleeve 6 to further compress it, thereby achieving well pressure assisted sealing.

[0028] The utility model has a simple structure and can achieve double sealing of the outlet channel on the oil casing head side through the first sealing ring 4 and the rubber sleeve 6, avoiding the failure of the pressure valve change caused by the loose sealing of the VR plug due to a long factory time, corrosion of the well fluid or foreign matter in the VR plug thread, thereby improving the effectiveness of the pressure valve change.

[0029] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A well pressure assisted VR plugging device, used to cooperate with the side outlet of the oil casing head, characterized in that: include: VR plug body, piston, rubber cylinder and piston rod; the VR plug body is threadedly connected to the outlet of the oil casing head side, and a first installation cavity for accommodating the piston is formed therein, and the piston seal is arranged in the first installation cavity; the piston rod is inserted into the first installation cavity from the bottom of the VR plug body and connected to the piston, and a channel is formed in the piston rod extending from the bottom end of the piston rod to the first installation cavity, so that the channel connects the bottom of the piston rod and the lower side of the piston in the first installation cavity; the piston rod is outer-circuited with a rubber cylinder, and the rubber cylinder is arranged between the outside of the bottom end of the VR plug body and the inside of the bottom end of the piston rod, so that when the pressure in the well pushes the piston and the piston rod to move outward, the piston rod compresses the rubber cylinder to expand to seal the outlet channel on the oil casing head side.

2. A well pressure assisted VR plugging according to claim 1, characterized in that: The VR plug body is provided with a VR plug thread connected with the outlet thread on the oil casing head side.

3. The VR plugging system according to claim 2, characterized in that: A first sealing ring is provided outside the VR plug body to match the sealing cone surface of the oil casing head side outlet, and the first sealing ring is located below the VR plug thread.

4. The VR plugging system according to claim 1, characterized in that: The piston rod is connected with the internal thread of the piston.

5. The VR plugging system according to claim 1, characterized in that: A second sealing ring is provided at the plugging position between the outside of the piston rod and the inside of the VR plug body.

6. The VR plugging system according to claim 1, characterized in that: A third sealing ring is provided at the contact point between the piston and the VR plug body.

7. The VR plugging system according to claim 1, characterized in that: The channel is "L" shaped.

8. The well pressure assisted plugging (VR) according to any one of claims 1 to 7, characterized in that: A J-shaped groove for connecting the VR plug picking and delivering device is formed on the upper end of the VR plug body, so that the hook of the VR plug picking and delivering device is hooked with the J-shaped groove of the VR plug body to achieve quick installation with the VR plug.

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